The lower four thoracic vertebrae transition toward the lumbar region, with T9 through T12 articulating with the corresponding ribs — T11 and T12 with floating ribs — and providing origin for parts of the diaphragm and abdominal muscles.
The lower thoracic vertebrae T9 through T12 represent the transition zone where the thoracic cage ends and the mobile thoracolumbar junction begins. T11 and T12 have floating ribs (not connected anteriorly). The thoracolumbar junction at T12-L1 is the most common site of major spinal column injury because the rigid thoracic spine meets the mobile lumbar spine, creating a stress riser that fractures preferentially at this level in high-energy trauma.
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